Period Siderian Period

Time runs left (older) → right (younger) · Hover a card for details

Great Oxidation Event begins (2500-2300 Ma).

2.50 Ga – 2.30 Ga · 200.00 Ma duration

Axis labels in Ma (millions of years ago) · Click a card for details

Siderian Period 1

2450 Ma – 2320 Ma Great Oxidation Event Oxygen fills the atmosphere Cyanobacteria flood the atmosphere with oxygen, rusting the oceans and enabling complex aerobic organisms.